We tried to change the ACL for a Libray after it was created using the Admin Tool. The desired ACL is in place for the library itself, but that is not enough because the start folder still has the initial ACL. We navigated multiple times through the item tree "children" <--> "parent" and all other available options, but we could never reach a point where changing the start folder's ACL was possible.

Are we right with that? Does anyone have a tip to reach that goal without deleting and re-creating the whole library?